Engines Iveco C10,C13, Cursor 10, Cursor 13. Manual — part 32

Mount the connecting rod caps (1) together with the bearing
shells. Tighten the screws (2) fixing the connecting rod caps
to a torque of 60 Nm (6 kgm). Using tool 99395216 (3),
further tighten the screws with an angle of 60

°.

CYLINDER HEAD

Before removing the cylinder head, check it is leakproof using
appropriate equipment. Replace the cylinder head if there is
any leakage.

47594

47583

36159

48625

Figure 69

Figure 70

Figure 71

Figure 72

Removing valves

Install and fix tool 99360261 (2) with bracket (4); tighten by
lever (1) until cotters are removed (3); remove the tool (2)
and the upper plate (5), the spring (6) and the lower plate (7).
Repeat the operation on all the valves.
Turn the cylinder head upside down and remove the valves (8).

The planarity (1) is checked using a ruler (2) and a thikness
gauge (3). If deformations exist, surface the head using proper
surface grinder; the maximum amount of material to be
removed is 0.3 mm.

Removing deposits and checking the valves

Remove carbon deposits using the metal brush supplied.
Check that the valves show no signs of seizure or cracking.
Check the diameter of the valve stem using a micrometer
(see Figure 73) and replace if necessary.

To check the clearance proceed as follows.
Connect the connecting rods to the relative main journals,
place a length of calibrated wire on the latter.

α

Checking the planarity of the head on the
cylinder block

(Demonstration)

After this process, you need to check the valve
recessing and injector protrusion.

Remove the caps and determine the clearance by comparing
the width of the calibrated wire with the graduated scale on
the case containing the calibrated wire.
Definitive assembly: check the diameter of screw threading
(2) it must not be less than 13.4mm along the entire length,
otherwise the screw is to be replaced; lubricate the pins and
bearings of the connecting rod; tighten the screws (2) as
described above.

The thread of the screws (2), before assembly, has
to be lubricated with engine oil.

Checking crankpin assembly clearance

NOTE

NOTE

35

CURSOR ENGINES F3A

SECTION 4 - OVERHAUL AND TECHNICAL SPECIFICATIONS

Base - May 2007

MAIN DATA OF VALVES AND VALVE GUIDES

* Measurement to be made after driving in the valve guides

Check with a micrometer that the diameter of the valve
stems is as indicated. If necessary, grind the valve seats with
a grinding machine, removing as little material as possible.

Figure 73

60617

Valve seats

Regrinding — replacing valve seats

The valve seats are reground whenever the valves or
valve guides are ground and replaced.

41032

Check the valve seats (2). If you find any slight scoring or
burns, regrind the surfaces (1) according to the angles shown
in Figure 73 and Figure 75. If it is necessary to replace them,
and taking care not to affect the cylinder head, remove as
much material as possible from the valve seats so that, with
a punch, it is possible to extract them from the cylinder head.

Heat the cylinder head to 80 — 100

°C and, using a drift, fit in

the new valve seats (2), chilled beforehand in liquid nitrogen.
Regrind the valve seats according to the angles shown in
Figure 75.

After regrinding the valve seats, using tool 99370415 and dial
gauge 99395603, check that the position of the valves in
relation to the plane of the cylinder head is:

-

-0.65 to -0.95 mm (recessing) intake valves;

-

-1.8 to -2.1 mm (recessing) exhaust valves.

Figure 74

73537

Figure 75

MAIN DATA OF VALVE SEATS

1. Intake valve seat — 2. Exhaust valve seat.

1

2

Valves

NOTE

36

SECTION 4 - OVERHAUL AND TECHNICAL SPECIFICATIONS

CURSOR ENGINES F3A

Base - May 2007

60619

To replace the injector case (2), proceed as follows:

- Thread the case (2) with tool 99390804 (1).

The steps described in Figs. 74 - 76 - 77 - 78 need to be
carried out by fixing the tools, with the bracket A, to the
cylinder head.

Checking clearance between valve-stem and
associated valve guide

Using a dial gauge with a magnetic base, check the clearance
between the valve stem and the associated guide. If the
clearance is too great, change the valve and, if necessary, the
valve guide.

The valve guides are removed with the drift 99360481.
They are fitted with the drift 99360481 equipped with part
99360295.
Part 99360295 determines the exact position of assembly of
the valve guides in the cylinder head. If they are not available,
you need to drive the valve guides into the cylinder head so
they protrude by 30.8-31.2 mm.
After driving in the valve guides, rebore their holes with the
smoother 99390311.

Valve guides

Replacing valve guides

73538

* Measurement to be made after driving in the valve guides

Figure 76

Figure 77

Replacing injector cases

Removal

37

CURSOR ENGINES F3A

SECTION 4 - OVERHAUL AND TECHNICAL SPECIFICATIONS

Base - May 2007

60621

- Using the tool 99390772 (2) remove any residues (1) left

in the groove of the cylinder head.

- Screw the extractor 99342149 (2) into the case (3).

Screw down the nut (1) and take the case out of the
cylinder head.

60620

60622

- Lubricate the seals (3) and fit them on the case (4). Using

tool 99365056 (2) secured to the cylinder head with
bracket A, drive in the new case, screwing down the
screw (1) upsetting the bottom portion of the case.

60623

- Using the reamer 99394041 (1-2), rebore the hole in the

case (3).

Figure 78

Figure 79

Figure 80

Figure 81

Assembly

38

SECTION 4 - OVERHAUL AND TECHNICAL SPECIFICATIONS

CURSOR ENGINES F3A

Base - May 2007